What It Is and Where It Fits
The Siemens 3RT1034-1AR64 is a SIRIUS power contactor in size S2, designed for switching motor loads in industrial control panels. It mounts via screw and snap-on onto 35 mm standard mounting rail per DIN EN 50022, so it integrates directly into a standard panel layout without adapters. Rated at 400 V at 50 Hz, it delivers 15 kW in AC-2 duty and 18.5 kW at 500 V, making it suitable for squirrel-cage motors on conveyors, pumps, and fans where the load profile matches AC-2 or AC-3 switching. The main current circuit uses screw-type terminals, with solid wire capacity up to 2x 4 mm² and stranded up to 2x 25 mm², so it handles typical motor feeder cables without needing lug adapters.
Key Ratings and What They Mean for Fit
The AC-3 rating at 400 V is the one that governs motor starting — this contactor switches a 15 kW motor in AC-3 duty, meaning it handles the inrush and breaks the running current under normal starting conditions. The AC-2 rating of 15 kW at 400 V covers slip-ring motor starting where the current stays closer to running levels. Switching frequency limits are 1 000 operations per hour in AC-3 and 750 in AC-2, so it's not meant for high-cycle applications like rapid reversing or jogging — those would need AC-4 rated gear at 250 ops/h. Auxiliary contact ratings cover 10 A at 24 V and 6 A at 230 V, which is enough for PLC inputs or relay coils in the control circuit. The 10 A at 24 V means it can drive multiple small loads without an interposing relay. Mechanical life is 10 million operations typical, so the contactor outlasts most panel refreshes under normal duty cycles.
Environmental and Mounting Considerations
Operating temperature range is -25 to +60 °C, with storage from -55 to +80 °C, so it's fine for unheated enclosures in temperate climates but watch the upper limit near heat sources like drives. Degree of pollution 3 means it's rated for conductive pollution environments typical of industrial panels — no special conformal coating needed for normal factory air. IP20 on the front, IP00 at the terminals — the terminal area is open, so it requires enclosure protection against accidental contact. Side-by-side mounting is allowed, which saves rail space in dense panels. Dimensions are 112 mm high, 55 mm wide, 164 mm deep — the S2 frame size fits standard 55 mm-wide contactor slots in most pre-drilled panel layouts.